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Wikidot has an arbitrary and inconsistent limit of which attributes are passed from blocks into HTML tags. It’s usually id, class, style, and possibly other attributes when Wikidot developers remembered.

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Attribute Name

Affected HTML Elements

Allowed?

Rationale

accept

<form>, <input>

YES

Affects the behavior of a file picker.

accept-charset

<form>

NO

The character set should be set at the platform level.

accesskey

Global attribute

NO

Could be used to hijack user focus.

action

<form>

NO

Allows submitting a form to an arbitrary destination.

align

<applet>, <caption>, <col>, <colgroup>, <hr>, <iframe>, <img>, <table>, <tbody>, <td>, <tfoot>, <th>, <thead>, <tr>

YES

Cosmetic attribute.

allow

<iframe>

NO

Can permit the child iframe to have access to browser resources like the microphone.

alt

<applet>, <area>, <img>, <input>

YES

Alt text is important for accessibility.

async

<script>

NO

Only affects scripts, which users cannot load.

autocapitalize

Global attribute

YES

Affects capitalization in input fields.

autocomplete

<form>, <input>, <select>, <textarea>

NO

Could be used to steal credentials by mimicking username or password fields.

autofocus

<form>, <input>, <select>, <textarea>

NO

Could be used to hijack user focus.

autoplay

<audio>, <video>

YES

Users can configure their browsers to block this, and it can be used to narrative effect.

background*

<body>, <table>, <td>, <th>

YES

Cosmetic attribute.

bgcolor*

<body>, <col>, <colgroup>, <marquee>, <table>, <tbody>, <tfoot>, <td>, <th>, <tr>

YES

Cosmetic attribute.

border*

<img>, <object>, <table>

YES

Cosmetic attribute.

buffered

<audio>, <video>

YES

Optimizing media buffering.

capture

<input>

NO

Allows media capture resources (e.g. camera) to be accessed.

challenge*

<keygen>

NO

Deprecated and involves a security mechanism.

charset

<meta>, <script>

NO

The character set should be set at the platform level.

checked

<command>, <input>

YES

Affects whether an input starts with a truthy value.

cite

<blockquote>, <del>, <ins>, <q>

YES

Allows citing the origin of contained elements.

class

Global attribute.

YES

Cosmetic attribute.

code

<applet>

NO

Applets are not permitted.

codebase

<applet>

NO

Applets are not permitted.

color*

<basefont>, <font>, <hr>

NO

Only permitted on <hr>, likely source of user error (e.g. adding it to [[span]]).

cols

<textarea>

YES

Cosmetic attribute.

colspan

<td>, <th>

YES

Cosmetic attribute.

content

<meta>

NO

Meta attributes are set at the site level.

contenteditable

Global attribute.

YES

Allows changing intractability of static elements.

contextmenu†

Global attribute.

NO

Experimental attribute.

controls

<audio>, <video>

YES

Allows exposing media controls.

coords

<area>

YES

Cosmetic attribute.

crossorigin

<audio>, <img>, <link>, <script>, <video>

NO

Affecting cross-origin settings is a possible security issue.

csp†

<iframe>

NO

Experimental attribute.

data-*

Global attribute.

YES

Allows users to add data tags to their DOM elements.

datetime

<del>, <ins>, <time>

YES

Useful metadata.

decoding

<ins>

YES

Allows optimizing page rendering.

default

<track>

YES

Configures media player behavior.

defer

<script>

NO

Only affects scripts, which users cannot load.

dir

Global attribute.

YES

Allows setting text direction for cosmetics and internationalization.

dirname

<input>, <textarea>

YES

Input field customization.

disabled

<button>, <command>, <fieldset>, <input>, <keygen>, <optgroup>, <option>, <select>, <textarea>

YES

Affects field interactivity.

download

<a>, <area>

YES

Allows links to force a download.

draggable

Global attribute.

YES

Allows making elements as draggable.

enctype

<form>

NO

Forms are not allowed to POST remotely.

enterkey-hint†

<textarea>, contenteditable

NO

Experimental attribute.

for

<label>, <output>

YES

Allows parenting elements.

form

<button>, <fieldset>, <input>, <keygen>, <label>, <meter>, <object>, <output>, <progress>, <select>, <textarea>

YES

Allows constructing forms.

formaction

<button>, <input>

NO

Allows setting a form’s action.

formenctype

<button>, <input>

NO

Allows setting a form’s content type.

formmethod

<button>, <input>

NO

Allows setting a form’s method type.

formnovalidate

<button>, <input>

NO

Allows setting a form’s validation type.

formtarget

<button>, <input>

NO

Allows setting a form’s target.

headers

<td>, <th>

YES

Customizing the IDs of table elements.

height*

<canvas>, <embed>, <iframe>, <img>, <input>, <object>, <video>

YES

Cosmetic attribute.

hidden

Global attribute.

YES

Cosmetic attribute.

high

<meter>

YES

Allows customizing a meter element.

href

<a>, <area>, <base>, <link>

YES

Allows creating links.

hreflang

<a>, <area>, <link>

YES

Allows specifying the language of the linked resource.

http-equiv

<meta>

NO

Meta attributes are set at the site level.

icon

<command>

NO

Command is deprecated.

id

Global attribute.

YES

Cosmetic attribute.

importance†

<iframe>, <img>, <link>, <script>

NO

Experimental attribute.

integrity

<link>, <script>

NO

Users cannot pull styling or scripts.

intrinsic-size*

<img>

NO

Deprecated attribute.

inputmode

<textarea>, contenteditable

YES

Allows setting the type of text input.

ismap

<img>

YES

Allows utilizing image maps.

itemprop

Global attribute.

YES

Allows adding properties to elements.

keytype

<keygen>

NO

Deprecated and involves a security mechanism.

kind

<track>

YES

Configures media player behavior.

label

<optgroup>, <option>, <track>

YES

Sets a title for this element.

lang

Global attribute.

YES

Defines the language used in this element.

language*

<script>

NO

Deprecated, and users cannot load scripts.

loading†

<img>, <iframe>

NO

Experimental attribute.

list

<input>

YES

Allows setting a list of premade options.

loop

<audio>, <bgsound>, <marquee>, <video>

YES

Configures media player behavior.

low

<meter>

YES

Allows customizing a meter element.

manifest*

<html>

NO

Deprecated and involves document construction.

max

<input>, <meter>, <progress>

YES

Allows customizing element limits.

maxlength

<input>, <textarea>

YES

Allows customizing element limits.

minlength

<input>, <textarea>

YES

Allows customizing element limits.

media

<a>, <area>, <link>, <source>, <style>

NO

Not well-used or supported.

method

<form>

NO

Allows setting a form’s method.

min

<input>, <meter>

YES

Allows customizing element limits.

multiple

<input>, <select>

YES

Allows multiple values to be selected or inputted.

muted

<audio>, <video>

YES

Configures media player behavior.

name

<button>, <form>, <fieldset>, <iframe>, <input>, <keygen>, <object>, <select>, <textarea>, <map>, <meta>, <param>

YES

Names the element.

novalidate

<form>

NO

Allows setting a form’s validation option.

open

<details>

NO

Not using details for collapsible elements.

optimum

<meter>

YES

Allows customizing a meter element.

pattern

<input>

YES

Requires that an input field match a particular regular expression.

ping

<a>, <area>

NO

Pingbacks are no longer in common use.

placeholder

<input>, <textarea>

YES

Allows setting a field placeholder hint.

poster

<video>

YES

Configures media player behavior.

preload

<audio>, <video>

YES

Configures media player behavior.

radiogroup*

<command>

NO

Deprecated attribute.

readonly

<input>, <textarea>

YES

Allows setting a field’s editability.

referrerpolicy†

<a>, <area>, <iframe>, <img>, <link>, <script>

NO

Experimental attribute, restricts referrer.

rel

<a>, <area>, <link>

NO

Allows setting referrer and opener policy.

required

<input>, <select>, <textarea>

YES

Whether an input element is required or not.

reversed

<ol>

YES

Cosmetic attribute.

rows

<textarea>

YES

Cosmetic attribute.

rowspan

<td>, <th>

YES

Cosmetic attribute.

sandbox

<iframe>

YES

Can be used to limit the behavior of an included iframe.

scope

<th>

YES

Cosmetic attribute.

scoped*

<style>

NO

Deprecated attribute.

selected

<option>

YES

Affects whether an option starts selected.

shape

<a>, <area>

YES

Cosmetic attribute.

size

<input>, <select>

YES

Cosmetic attribute.

sizes

<link>, <img>, <source>

YES

Specifies the sizes this element can be.

slot

Global attribute.

NO

Further research on web components and slots is needed.

span

<col>, <colgroup>

YES

Cosmetic attribute.

spellcheck

Global attribute.

YES

Indicate whether the element should be spellchecked.

src

<audio>, <embed>, <iframe>, <img>, <input>, <script>, <source>, <track>, <video>

YES

The source of the media or object being included.

srcdoc

<iframe>

NO

The src attribute should be used instead.

srclang

<track>

YES

Allows setting subtitle language.

srcset

<img>, <source>

YES

Responsive media settings.

start

<ol>

YES

Cosmetic attribute.

step

<input>

YES

Cosmetic attribute.

style

Global attribute.

YES

Cosmetic attribute.

summary*

<table>

NO

Deprecated attribute.

tabindex

Global attribute.

YES

Allows setting tab order.

target

<a>, <area>, <base>, <form>

YES

Allows setting an element’s target.

title

Global attribute.

YES

Allows setting tooltips.

translate

Global attribute.

YES

Assists in localization and translation.

type

<button>, <input>, <command>, <embed>, <object>, <script>, <source>, <style>, <menu>

YES

Allows setting the element type.

usemap

<img>, <input>, <object>

YES

Allows utilizing image maps.

value

<button>, <data>, <input>, <li>, <meter>, <option>, <progress>, <param>

YES

Default value of the element.

width*

<canvas>, <embed>, <iframe>, <img>, <input>, <object>, <video>

YES

Cosmetic attribute.

wrap

<textarea>

YES

Cosmetic attribute.

* Item is deprecated.
† Item is experimental.

...